The laptop is using the dual 330 watts PSU , so it can't be the power supply. Could it just be the laptop itself that is tripping the PSU ?

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Could be an internal circuit sensing the MXM slot is requesting too much power, and kicks it off AC power to stop it from burning up and instead switches to battery to force lower clocks/voltage. This is just me spitballing though, I'm not a computer engineer and I can't begin to accurately postulate what the hell is going on here lol

Could be an internal circuit sensing the MXM slot is requesting too much power, and kicks it off AC power to stop it from burning up and instead switches to battery to force lower clocks/voltage. This is just me spitballing though, I'm not a computer engineer and I can't begin to accurately postulate what the hell is going on here lol

That's very interesting, I'm assuming it's what @Raidriar said. Because the M18x can use dual PSUs fine and if I remember correctly, so can the M17x series. The MXM port must be tripping. Maybe try lowering the clocks and lower the voltage in MSI Afterburner to see if it helps.

Can you post an exact picture of the 1080? I'm curious to see if it'd fit an M18x lol

That's very interesting, I'm assuming it's what @Raidriar said. Because the M18x can use dual PSUs fine and if I remember correctly, so can the M17x series. The MXM port must be tripping. Maybe try lowering the clocks and lower the voltage in MSI Afterburner to see if it helps.

Can you post an exact picture of the 1080? I'm curious to see if it'd fit an M18x lol

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It won't fit. The extended top piece is touching one of the chip on the motherboard, thus not making the card lat flat.